followed by the two digits of the ring code where the first digit indicated the number of long rings, followed by the second digit indicating the number of short rings. Thus spoken, for example, as "nine, three; ring two, two" to mean subscriber No. 93 with ringing code 2 long and 2 short, and written as "93R22", (and if outside the given exchange, then the exchange would be asked for by name before the requested number and ringing code, e.g. "Rockridge nine, three; ring one, two" i.e. "(On the) Rockridge (exchange), (subscriber No.) nine, three; ring one long, and two short," and written as “Rockridge 93R12”. (The two examples cited in this paragraph are taken directly from usage in the 1935 American film Party Wire.) Whilst this practice was common, it was not ubiquitous, since despite giving a standard configuration for terse, easily interpreted numbers with their respective ring codes, its chief functional drawback was with the first ring always being long and the second always being short, which limited the number of brief and thus practical ringing combinations that could be used on single multiparty subscriber numbers. Further to this functional deficiency, was a twofold practical deficiency. For though one was only to answer one's own ringing code, every party on the same subscriber line could hear all the ringing codes. This meant firstly, frequently ringing telephones were a disruptive annoyance, as each party on the line had to stop to listen every time the telephone rang to determine if they were the party being called on any given ring. Secondly, if any party on a given line should so be inclined, there was the opportunity to listen to other parties' calls. More selective ringing methods were introduced using various technologies. In the system of divided ringing, the ringing circuit was separated from the talking circuit by adding a ground connection between the central office and the subscriber stations for ringing. On the same subscriber line, one party used the tip side of the line and ground for ringing, whilst the other party on the same line used the ring wire and ground for ringing, to achieve full selectivity for two-party lines, in which only the selected station would ring. These names for the wires are derived from the paired cord plugs—used on a manual switchboard—composed of three parts: the tip and the sleeve separated by a narrow metal